Problem Upgrading Plugin from CRM 4.0 to 2016

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Microsoft.Xrm.Sdk;
using Microsoft.Crm.Sdk;
using Microsoft.VisualBasic;
using System.ServiceModel;

namespace newPluginsCRM2016
{
    public class CreateApplicationPlugin : IPlugin

    {
        //private string _secureInformation;
        //private string _unsecureInformation;

        public void Execute(IServiceProvider serviceProvider)
        {
            //Extract the tracing service for use in debugging sandboxed plug-ins.
            ITracingService tracingService =
                (ITracingService)serviceProvider.GetService(typeof(ITracingService));

            // Obtain the execution context from the service provider.
            IPluginExecutionContext context = (IPluginExecutionContext)
                serviceProvider.GetService(typeof(IPluginExecutionContext));

            // The InputParameters collection contains all the data passed in the message request.
            if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
            {
                // Obtain the target entity from the input parameters.
                Entity entity = (Entity)context.InputParameters["Target"];

                // Verify that the target entity represents an account.
                // If not, this plug-in was not registered correctly.
                if (entity.LogicalName != "new_application")
                    return;

                try
                {
                    ///////////////////////// Begin Business Logic ////////////////////////

                    // Get appliation id
                    Guid MyApplication = new Guid(context.OutputParameters["id"].ToString());

                    var crm = new CrmServiceContext();

                    // Get Application details
                    var MyApplication = (from application in crm.GetEntities("new_application") where application.GetPropertyValue<Guid>("new_applicationid") == applicationId select application).Single();

                    // Get a list of all requirements for selected application type
                    var applicationRequirements =
                        from requirements in crm.GetEntities("new_requirement")
                        join reqm2m in crm.GetEntities("new_applicationtype_requirement")
                            on requirements.GetPropertyValue<Guid>("new_requirementid") equals reqm2m.GetPropertyValue<Guid>("new_requirementid")
                        join applicationtypes in crm.GetEntities("new_applicationtype")
                            on reqm2m.GetPropertyValue<Guid>("new_applicationtypeid") equals applicationtypes.GetPropertyValue<Guid>("new_applicationtypeid")
                        where applicationtypes.GetPropertyValue<Guid>("new_applicationtypeid") == MyApplication.GetPropertyValue<Guid>("new_applicationtypeid")
                        select requirements;

                    // Add the requirements to the application
                    foreach (var applicationRequirement in applicationRequirements)
                    {
                        var requirement = crm.CreateEntity("new_applicationrequirement");
                        requirement.SetPropertyValue("new_requirementid", applicationRequirement.GetPropertyValue<Guid>("new_requirementid"));
                        requirement.SetPropertyValue("new_applicationid", applicationId);
                        requirement.SetPropertyValue("new_contactid", MyApplication.GetPropertyValue<Guid>("new_contactid"));

                        crm.AddObject("new_applicationrequirement", requirement);
                        crm.SaveChanges();
                    }

                    // Get a list of all application fees for selected application type
                    //CacheManager.GetBaseCache().Remove("adxdependency:crm:entity:new_fee"); 
                    var applicationFees =
                        from fees in crm.GetEntities("new_fee")
                        join feetypem2m in crm.GetEntities("new_applicationtype_feetype")
                            on fees.GetPropertyValue<Guid>("new_feetypeid") equals feetypem2m.GetPropertyValue<Guid>("new_feetypeid")
                        join applicationtypes in crm.GetEntities("new_applicationtype")
                            on feetypem2m.GetPropertyValue<Guid>("new_applicationtypeid") equals applicationtypes.GetPropertyValue<Guid>("new_applicationtypeid")
                        where applicationtypes.GetPropertyValue<Guid>("new_applicationtypeid") == MyApplication.GetPropertyValue<Guid>("new_applicationtypeid")
                        where fees.GetPropertyValue<Guid>("new_renewalyearid") == MyApplication.GetPropertyValue<Guid>("new_renewalyearid")
                        select fees;

                    // Add the fees to the application
                    int NumMonths = MyApplication.GetPropertyValue<Int32>("new_numberofmonths");

                    foreach (var applicationFee in applicationFees)
                    {
                        var quantity = 1;
                        decimal? amount = 0;

                        if (applicationFee.GetPropertyValue<int>("new_defaultunit") == 2) //Month
                        {
                            quantity = NumMonths;
                        }

                        //throw new InvalidPluginExecutionException(applicationFee.GetPropertyValue<Decimal>("new_proratedamount").ToString());

                        if (MyApplication.GetPropertyValue<DateTime>("new_effectivedate") != new DateTime(1, 1, 1) && (MyApplication.GetPropertyValue<DateTime>("new_effectivedate").Month >= 9 || MyApplication.GetPropertyValue<DateTime>("new_effectivedate").Month < 3) && applicationFee.GetPropertyValue<Decimal>("new_proratedamount") > 0)
                        {
                            amount = applicationFee.GetPropertyValue<Decimal>("new_proratedamount");
                        }
                        else
                        {
                            amount = applicationFee.GetPropertyValue<Decimal>("new_amount");
                        }

                        var fee = crm.CreateEntity("new_applicationfee");

                        fee.SetPropertyValue("new_applicationid", applicationId);
                        fee.SetPropertyValue("new_feeid", applicationFee.GetPropertyValue<Guid>("new_feeid"));
                        fee.SetPropertyValue("new_quantity", quantity);
                        fee.SetPropertyValue("new_amount", amount, typeof(CrmMoney));
                        fee.SetPropertyValue("new_unit", applicationFee.GetPropertyValue<int>("new_defaultunit"));
                        fee.SetPropertyValue("new_total", quantity * amount);

                        crm.AddObject("new_applicationfee", fee);
                        crm.SaveChanges();
                    }

                    ///////////////////////// End Business Logic //////////////////////////

                }
                catch (FaultException<OrganizationServiceFault> ex)
                {
                    throw new InvalidPluginExecutionException("An error occurred in the newPluginsCRM2016 plug-in.", ex);
                }

                catch (Exception ex)
                {
                    tracingService.Trace("CreateApplicationPlugin: {0}", ex.ToString());
                    throw;
                }
            }
        }
    }
}